Apparatus for recovering furnace ventilator fume



May 24, 1932- B. w. GoNsER 1,860,091

APPARATs Fon REcovERING FURNAGE Y VENTILATOR FUME Filed Aug 8. 1929 Eg. a

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used in Vcharging and discharging the retorts and drawing metal to pass without interference, but no further than is necessary to intercept the gas stream issuing from the condensers. The hood is so positioned as to effectively catch the fume laden gases and at the same time prevent the entrance of an excess of outside air. The hinged extension 9 further assists in. preventing an excessive amount of outside air fromentering the hood and subsequently being drawn to the recovery apparatus. Valves 6 assist in securing the proper local draft control particularly when drawing metal and discharging the retorts.

Gas is withdrawn from .the hood at such a rate as to approximately equalize the pressure caused by the natural draft up the face of the furnace. In this manner a minimum of outside air is drawn into the hood, yet

practically all of t-he fume evolved is en- .trapped In actual practice of the fume has been recovered from the condensers without handling more than 75,000 cubic feet of gas per minute at 1250 F. per block of B00 retorts.

The dust recovered in the baghouse is preferably charged along with other zinciferous materials to a sintering machine together with the usual charge which is being prepared for retort smelting. The dust thus becomes incorporated in the sinter and is rendered suitable for smelting in the retort. The sinter is then crushed or broken in the usual manner and is charged to the retort in which the metal values are recovered. The process is accordingly cyclic in that the fume escaping from the retort is caught and again rendered suitable for application to the retort.

The addition of ventilator fume to the regular sintering machine charge has been found to assist in the operation inasmuch as the4 fume operates as a diluent to lower the sulphur contentofthe charge. The percentage of fume recovered varies widely in practice and is dependent largely on the operating conditions of the retort. In the drawings the hood has been shown as applied to a Belgian retort furnace, although it is to be understood that the invention may be applied to various other types of zinc furnaces as desired.

While certain novel features of the invention have been shown and described and are y pointed out in the annexed claims, it vwill be the draft to the various furnaces and termi- 2. In combination with a bank of zinc retort furnaces having an operating shield, a hood positioned above and in front of said furnaces and extending throughout the length of said bank, said hood being provided with a plurality of horizontally spaced valves for selectively controlling` the draft f to the various furnaces and terminatingY ink being provided` with a plurality of horizon-V tally spaced valves for selectively controlling the draft to the various furnaces and terminating in a horizontal duct by means of which the fume is withdrawn, and a downwardlyk extending extension hingedly secured to said `hood and adapted to hang in front of said retorts for further controlling the flow of fume. v

4. In combination with a bank of zincV retort furnaces, a hood positioned above and in front of `said furnaces and extending throughout the length of said'bank, a horizontal duct communicating with said hood for withdrawing fume therefrom, said hood having a 'plurality of horizontally spaced valves located therein for variably controlling the draft longitudinally thereof,

In testimonyy whereof I have hereunto set my hand.

v BRUCE W. GONSER.

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